Don't use post multiplication on transforms with compatible pairs of operations

third_party/WebKit/LayoutTests/animations/interpolation/transform-interpolation.html

Index: third_party/WebKit/LayoutTests/animations/interpolation/transform-interpolation.html
diff --git a/third_party/WebKit/LayoutTests/animations/interpolation/transform-interpolation.html b/third_party/WebKit/LayoutTests/animations/interpolation/transform-interpolation.html
index 175bda21fd7fae7278bd1604b2ece03c1ff9976f..318436a3e7d8c5184e289c4ac8424b15572b27c7 100644
--- a/third_party/WebKit/LayoutTests/animations/interpolation/transform-interpolation.html
+++ b/third_party/WebKit/LayoutTests/animations/interpolation/transform-interpolation.html
@@ -323,6 +323,18 @@ assertInterpolation({
 ]);
 assertInterpolation({
   property: 'transform',
+  from: 'scaleX(0)',
+  to: 'scaleY(0)',
+}, [
+  {at: -1, is: 'scale(-1, 2)'},
+  {at: 0, is: 'scale(0, 1)'},
+  {at: 0.25, is: 'scale(0.25, 0.75)'},
+  {at: 0.75, is: 'scale(0.75, 0.25)'},
+  {at: 1, is: 'scale(1, 0)'},
+  {at: 2, is: 'scale(2, -1)'},
+]);
+assertInterpolation({
+  property: 'transform',
   from: 'none',
   to: 'scale3d(2, 3, 5)'
 }, [